An unprecedented rise in maturity similar to that of a growth spurt.
Local 1: Hey why did the chicken cross the road?
Local 2: I have no idea, it would be spectacular if you could tell me.
Local 1: To get to the other side
Local 2: I do not find that even slightly humorous.
Local 1: But you found that funny last week
Local 2: Yes well I have had a maturity spurt which allows me to realize the childish nature of that joke.